Ivon Vicomte de Cotentin
- Born: Manche, Normandy
- Marriage: Emma de Bretagne 797
- Died: After 1066, England/Normandy
 General Notes:
~The Register Book of Inglebye, Pedigree taken from Foster's Pedigrees, pg. VI 797
~George Ormerod's The History of County Palatine and City of Chester, Vol I, p. 744, Ivon, Vicount of Cotentin in Nomandy married to Emma, daughter of Geoffrey, comté de Bretagne by Hedwidge, daughter of Richard I, Duke of Normandy. 713
Noted events in his life were:
• Background Information. 726
Ivon, Viscount of the Cotentin in Normandy, married Emma, sister of Alan III, Count of Britanny, and the daughter of Geoffrey, Duke of Brittany, and his wife Hadwige (of Wavise), daughter of Richard I, Duke of Normandy.
~Fenwick Allied Ancestry, pg. 36
• Background Information. 527
Ivon, a Noble man of Normandy had six sons who came to England with William the Conqueror. They were:
Nigel, Baron of Halton & Constable of Chester, father to William Fitz Nigel, Baron of Halton.
Geoffrey, who had lands and barony of Stopford
Hubbard, had the lands of Dutton, and was the father of Hugh de Dutton.
Edward, had the manor of Haselwall.
Horswaine, had the manor of Shrigley.
Wolfath, had the mannor of Hatton by gift of his brother Nigel. He was the progenitor of the Hatton family in Cheshire.
~The Visitation of Cheshire in the Year 1580, p. 110
• Background Information. 713
Nigell, the first baron of Halton, is believed to be the son of Ivo (governor of Constantia in Normany) by Emme, sister to Adam earl of Bretagne. Nigel baron of Halton had two sons, William and Richard, as appears by the charter of the foundation of the abby of St Werburge in Chester by Hugh Lupus in 1093, and also according to the charter of confirmation to the said abby by Earl Richard in 1119, both of which both brothers were witnesses.
~Ormerod's History of Cheshire, Vol. I, p. 690
Ivon married Emma de Bretagne, daughter of Geoffroi Duc de Bretagne and Hawise de Normandy.726
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